Study On Population Dynamics And Regeneration Factors Of Restored Vegetation In The Reclamation Area Of Opencast Coal Mine In Pingshuo

This study takes the fixed monitoring plot of the south dumping site of the large-scale open-pit coal mine of Antaibao in China Coal as the research platform,and adopts the method of long-term positioning monitoring.Based on the reclaimed areas of Pingshuo Open-pit Coal Mine in 2010 and 2014,two All seedlings and saplings of Robinia pseudoacacia L.+ Pinus tabulaeformis(A)and Robinia pseudoacacia(B)were investigated.The composition,quantity and spatial and temporal patterns of seedling saplings in2010-2014 were studied by using data.The driving factor for survival.The main conclusions are as follows:Under different plant configuration patterns,the results showed that:(1)In terms of tree species composition,the species composition of seedlings and saplings in A-type land changed,but there was no change in B-like land.(2)In terms of quantitative composition,the number of seedlings in the A-like plot increased significantly,but the number of seedlings in the B-like plot decreased.(3)In terms of the number and composition of new and death,the newly added seedlings in the two plots were eucalyptus,while the most increased saplings were hedgehogs.The most common seedling death is hedgehog.The results showed that the heterogeneity of habitats caused significant differences in the quantitative dynamics of regenerated seedlings(saplings)and the spatial distribution patterns of dead seedlings.The correlation analysis between the regeneration seedlings and the canopy openness showed that the allocation pattern of Pinus tabulaeformis and Robinia pseudoacacia on the slope(sample A),the newly added seedlings of Eucalyptus and Robinia pseudoacacia in 2014 were positively correlated or significantly positive with the canopy openness.Related.The linear regression analysis of the survival rate and soil factors of various seedlings and saplings showed that there was a significant negative correlation between the survival rate of eucalyptus seedlings and water content,and a significant positive correlation with p H.There was a significant positive correlation between the survival rate of the young locust tree and the organic matter content.Among the two plots,the survival rate of the updated seedlings and saplings was greatly affected by their height,factor and biological factors.This shows that after twenty years of vegetation restoration,environmental factors(especially nutrients and water in the soil)are no longer the main limiting factors limiting the restoration of vegetation.